I have been thinking of this happening since they announced the package for Rose and Crown. The new show starts in the Fall and I wouldn't be surprised at all if Disney will start a dinner package at SRT in preparation for the permanent show in 2020.
The current view for Illuminations isn't as good as R&C or other places around WS, but the experience at SRT between the food, the friendly staff and the view makes a great evening. They may be considering the view from SRT and other areas around the lagoon while they are making the new show to make it a fantastic view from many places. You can bet they will charge for it. The R&C package is proving to be success for them. They want to find any way they can to make an extra dollar so all the hidden treasures we've enjoyed for free will disappear, IMO.